Correct Answer: (a) Argentina, Mexico, South Africa and Turkey
Solution:The G20 (or Group of Twenty) is an international forum for the governments and central bank governors from 19 countries, the European Union (EU) and the African Union (AU). It was founded in 1999 with the aim to discuss policy related to global economics and finance. The members of G20 are-Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Republic of Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey (officially Turkiye'), The United Kingdom, The United States, The European Union and The African Union. Hence, option (a) is the correct answer.